Effect of CuO chains on the local density of states in the vortex phase of YBa2Cu3O7

We examine the effects of the CuO chains on the density of states in the vortex phase in YBa2Cu3O7, via a calculation based on the tight-binding proximity model. In this model, chain superconductivity results from single-electron hopping between the intrinsically-normal chains and intrinsically-superconducting CuO2 planes. The calculations are based on self-consistent solutions of the Bogolyubov-de Gennes equations for a bilayer consisting of a single CuO2 layer and a single CuO chain layer. We find that, in addition to the dispersing resonances found in single-layer models, the chains introduce a second set of dispersing resonances associated with the induced gap in the chain layer. These new resonances are highly anisotropic and distort the vortex core shape. PACS numbers: 74.25.Jb,74.25.Qt,74.72.Bk Submitted to: Supercond. Sci. Technol. Effect of Chains on the LDOS in the Vortex Phase of YBCO 2